Bud Selig appears on the Late Show with David Letterman. / YouTube

by Nick Schwartz, USA TODAY Sports

by Nick Schwartz, USA TODAY Sports

With the All-Star Game festivities centered in Queens, MLB Commissioner Bud Selig ventured to Manhattan to talk to David Letterman on the Late Show, which aired Monday evening. When asked about the future of Alex Rodriguez and the other players implicated in the Biogenesis investigation, Selig remained relatively tight-lipped but indicated that he knows which players face suspension.

"Only time will tell," Selig said. "We're in the midst of a very thorough and tough investigation on all of this, because I really believe it's not only the right thing to do, but we're going to do it and that's all I can tell you."

If the evidence provided by the ongoing Biogenesis investigation leads Selig to believe Rodriguez was administered performance-enhancing drugs, the Yankees third baseman faces at least a 50-game suspension. Later in his interview, Letterman asked Selig if Rodriguez would be one of the players suspended by Major League Baseball for his connection to the Biogenesis investigation.

"I'd rather not say," Selig responded. When Letterman followed up by asking if Selig knew which players would be suspended, the commissioner confirmed, "I do know."

Selig also spoke extensively on the subject of steroids, saying that he's "very proud" of the progress the league has made in eradicating the use of performance enhancing drugs.